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| 771 | - | 1 | /**************************************************************************** |
| 902 | - | 2 | * Copyright (C) 2009-2011 by Claas Anders "CaScAdE" Rathje * |
| 771 | - | 3 | * admiralcascade@gmail.com * |
| 4 | * Project-URL: http://www.mylifesucks.de/oss/c-strom/ * |
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| 5 | * * |
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| 6 | * This program is free software; you can redistribute it and/or modify * |
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| 7 | * it under the terms of the GNU General Public License as published by * |
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| 8 | * the Free Software Foundation; either version 2 of the License. * |
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| 9 | * * |
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| 10 | * This program is distributed in the hope that it will be useful, * |
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| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of * |
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| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
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| 13 | * GNU General Public License for more details. * |
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| 14 | * * |
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| 15 | * You should have received a copy of the GNU General Public License * |
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| 16 | * along with this program; if not, write to the * |
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| 17 | * Free Software Foundation, Inc., * |
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| 18 | * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. * |
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| 19 | ****************************************************************************/ |
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| 20 | |||
| 21 | |||
| 22 | /**************************************************************************** |
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| 23 | * * |
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| 24 | * Most of the i²c/twi code is originally from * |
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| 25 | * http://www.rn-wissen.de/index.php/TWI_Slave_mit_avr-gcc * |
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| 26 | * * |
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| 27 | ****************************************************************************/ |
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| 28 | |||
| 29 | #define I2C_BUFFER_SIZE 10 |
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| 30 | |||
| 31 | // ACK |
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| 32 | #define TWCR_ACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC); |
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| 33 | // NACK |
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| 34 | #define TWCR_NACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(0<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC); |
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| 35 | // non addressed slave mode |
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| 36 | #define TWCR_RESET TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC); |
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| 37 | |||
| 38 | |||
| 39 | #define CSTROM_I2C 0b00100000 // = 0x20 = 32 |
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| 40 | |||
| 41 | volatile uint8_t i2c_rx_buffer[I2C_BUFFER_SIZE]; |
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| 42 | |||
| 43 | // here we use the same for SPI and TWI |
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| 44 | extern union SPI_buffer_t SPI_buffer; |
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| 45 | #define i2c_tx_buffer SPI_buffer.buffer.c |
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| 46 | |||
| 47 | // otherwise take this |
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| 48 | //volatile uint8_t i2c_tx_buffer[I2C_BUFFER_SIZE]; |
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| 49 | |||
| 50 | |||
| 51 | volatile uint8_t i2c_buf_adr; |
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| 52 | |||
| 53 | |||
| 54 | void init_twi_slave (uint8_t); |